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According to theory analysis, practical survey and computer simulation, the foundation of the coal mine practical survey data and the dominant of the theory analysis and the numerical simulation, this paper discusses the fully-mechanized caving and goaf flow field and the rule of gas distribution, and influence factors of goaf gas emission, caving mining gas for future comprehensive management provide the scientific basis.The dynamic distribution and the permeability performance of the transverse "three zones" of the gob are deeply investigated by the theory analysis of the bulking characteristic of the gob caving rock and the practical monitor of the mine pressure, lay a foundation for the numerical simulation of the gob air flow field. The gob seepage mathematics model and the rule of gas distribution are educed by the cooperation of Hydrodynamics, Porous Medium Seepage Mechanics, Computational Fluid Dynamics and diffusion theory, the gob air flow condition and the rule of gas distribution is numerical simulated by the software Fluent, the distribution regulation of flow velocity, pressure and the rule of gas distribution are discovered. The main technology factors that affect the gob gas emission, such as the air quantity, the air pressure, the advancement distance and advancement velocity, are comprehensively analyzed, meanwhile simulate the gas distribution regularity of commonly used various ventilation system, and predict their gas treatment effect.
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